I have to 2 lawn and garden batteries. both are the same and brand new.
cranking amps: 350
cold cranking amps: 275
How can I figure out the amp hours?
I've got two 10.5 amp wheelchair motors needing 24v, are these batteries going to be enough to run for like 2hrs straight??
With a CCA rating of 275A, the capacity should be in the range of around 20Ah (give or take).
That's worth less than 1 hour, since the capacity only holds for a lower current drain. Most batteries re specified by the 20 hour rate, some by the 5 hour rate. Any higher drain results in less capacity, so you'll need more than double your present capacity, at least if you wanna drain 10.5A continuously for 2 hours without pause.
If the batteries doesn't have the specs stamped on them, try Googling for their name and model. You should be able to find the specs for most common lead-acid batteries.